Quasi-direct numerical simulations of the flow characteristics of a thermal plasma reactor with counterflow jet  

作　　者：周旭 陈仙辉 叶桃红 朱旻明 夏维东 Xu ZHOU;Xianhui CHEN;Taohong YE;Minming ZHU;Weidong XIA(School of Engineering Science,University of Science and Technology of China,Hefei 230022,People’s Republic of China;Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,People’s Republic of China)

机构地区：[1]School of Engineering Science,University of Science and Technology of China,Hefei 230022,People’s Republic of China [2]Institute of Systems Engineering,China Academy of Engineering Physics,Mianyang 621999,People’s Republic of China

出　　处：《Plasma Science and Technology》2023年第7期72-81,共10页等离子体科学和技术（英文版）

基　　金：supported by National Natural Science Foundation of China (Nos. 12035015 and 12105282)。

摘　　要：Three-dimensional quasi-direct numerical simulations have been performed to investigate a thermal plasma reactor with a counterflow jet. The effects of the momentum flux ratio and distance between the counterflow jet and the thermal plasma jet on the flow characteristics are addressed. The numerical results show that the dimensionless location of the stagnation layer is significantly affected by the momentum flux ratio, but it is not dependent on the distance.Specifically, the stagnation layer is closer to the plasma torch outlet with the increase of the momentum flux ratio. Furthermore, the flow regimes of the stagnation layer and the flow characteristics of the thermal plasma jet are closely related to the momentum flux ratio. The characteristic frequencies associated with the different regimes are identified. The deflecting oscillation flow regimes are found when the momentum flux ratio is low, which provokes axial velocity fluctuations inside the thermal plasma jet. By contrast, for cases with a high momentum flux ratio, flapping flow regimes are distinguished. The thermal plasma jets are very stable and the axial velocity fluctuations mainly exist in the stagnation layer.

关 键 词：thermal plasma jet counterflow jet quasi-direct numerical simulations flow regime 

分 类 号：O53[理学—等离子体物理]